Sparking plug for internal-combustion engines.



No. 870,369. PATENTED NOV. 5, 1907. A. E. LAMKIN. SPARKING PLUG FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED DEC. 4. 1906.

ARTHUR EDWIN LAMKIN, 01f oRoYDoN, ENGLAND.

SPARKING PLUG FOR INTERNAL-COMBUSTION ENGINES.

\Sp ecification of Letters Patent.

Patented Nov. 6, 1907.

' Application filed December 4. 1905- Serial No. 290;885.

To all whom it may concern:

Be it knownthat ARTHUR EDWIN LAMKIN, a subject of the King of Great Britain, residing at 136 High street, Croydon, Surrey, England, has invented certain new and useful Improvements in Sparking Plugs for Inter rial-Combustion Engines, of which the following is a specification.

The object of my inventionis to provide means to so construct an electric sparking plug for use with internal combustion engines, that the points of discharge and the insulating material are constantly being automatically cleaned, and at the same time be kept cool, whereby the sparking to -explode the combustible mixture in the cylinder is produced in an eflicient manner at each working stroke of the piston.

My invention will be clearly understood from the following description aided by the example shown' on the annexed drawings, which represents an elevation of a sparking'plug with part broken away to illustrate my invention.

According to my invention, I construct the conductor A of metal tubing, the free end being bent for its end to face the end of the other conductor B, which is arranged in the insulating portion 0 of the sparking plug in the well known manner: The other end of the tube A I screw to the sparking plug, and in such end, I

form a hole D, which leads into a chamber E closable by a nut F carrying a non return valve G, and provided with holes H for the admission of air from the atmosphere, said holes being coverableby a wire gauze or other protector I to prevent ingress of dust and dirt.

The electric current when established by the usual switch, flows through the cylinder into which the plug is screwed as usual, through the plug and the tube A to the wire B in the'usual manner.

In action, the plug occupying its usual position in the cylinder on the suction stroke, air will be drawn through the valve G, passage D and tube A, and by its pressure or force, will impinge on the wire' B and porcelain C and remove any dirt or debris due to the explosion which may be on either, and thus keep them clean, and on the compression stroke, the pressure in the cylinder will act on the column of air in the tube A and passage D and close the valve, so that there will be noescape, and the amount'of incoming air on the suction stroke will not be suflicient to interfere with the nature of the charge drawn into the cylinder through the usual port or ports.

In some cases, the wire B may be the tube and have its valve connection at the top of the sparking plug, and such tube will be bent over to face the end of the conductor'A for effecting the cleaning operation, the conductor A having its end turned up and being positioned between the porcelain C and the end of the now bent over tube B, or the tube and wire may run through the porcelain insulator and connected by separate wires to'the battery.

The example shown on the drawings is only illustrative of carrying my invention into effect, and the construction may be varied in many ways, the feature being the indrawing of air through a tube forming one of the conductors of a sparking plug to keep clean the other conductor, so that an eflicient sparking is always maintained.

What I claim and desire to secure by Letters Patent is:

In an electrical device of the class described, a sparking plug comprising a conductor insulated from said plug, said plug having a passageway terminating at one end in a chamber, a nut secured in said chamber and having an opening therethrough, a non-return valve arranged within the opening in the nut, said nut further provided with holes for admitting air from the atmosphere within the said chamber, protective means covering said holes to exclude dust, and a tube forming a conductor mounted in the other end of the passage-way and bent on itself to bring the bore of the tube in direct 'alinement with the first mentioned conductor.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARTHUR EDWIN IIAMKIN.

Witnesses:

RICHARD CORE GARDNER, LrNwooD FERDINAND Gnomes.v 

